chore: synchronize code and database schema (#8577)

* chore: remove default null

null is always the default value if a table column is nullable, and typeorm's
@Column only accepts strings for default.

* chore: synchronize code with database schema

* chore: sync generated migrations with code

packages/backend/src/models/entities/access-token.ts

@@ -15,7 +15,6 @@ export class AccessToken {
 
 	@Column('timestamp with time zone', {
 		nullable: true,
-		default: null,
 	})
 	public lastUsedAt: Date | null;
 
@@ -29,7 +28,6 @@ export class AccessToken {
 	@Column('varchar', {
 		length: 128,
 		nullable: true,
-		default: null,
 	})
 	public session: string | null;
 
@@ -52,7 +50,6 @@ export class AccessToken {
 	@Column({
 		...id(),
 		nullable: true,
-		default: null,
 	})
 	public appId: App['id'] | null;
 
@@ -65,21 +62,18 @@ export class AccessToken {
 	@Column('varchar', {
 		length: 128,
 		nullable: true,
-		default: null,
 	})
 	public name: string | null;
 
 	@Column('varchar', {
 		length: 512,
 		nullable: true,
-		default: null,
 	})
 	public description: string | null;
 
 	@Column('varchar', {
 		length: 512,
 		nullable: true,
-		default: null,
 	})
 	public iconUrl: string | null;